The full moon cycle is slightly less than 14 synodic months and slightly less than 15 anomalistic months.
2.
The saros is an eclipse cycle of 223 synodic months = 239 anomalistic months = 242 draconic months.
3.
An eclipse cycle must comprise close to an integer number of anomalistic months in order to perform well in predicting eclipses.
4.
The time between one perigee and the next is slightly longer than the sidereal month and known as the anomalistic month.
5.
An anomalistic month is longer than a sidereal month because the perigee moves in the same direction as the Moon is orbiting the Earth, one revolution in nine years.
6.
Because of the non-integer number of anomalistic month each eclipse varies in type, i . e . total vs . annular, and greatly varies in length.
7.
Unlike the saros, the inex is not close to an integer number of " anomalistic months " so successive eclipses are not very similar in their appearance and characteristics.
8.
It varies in a period of time called a "'lunation "', also called synodic month; its duration is about 2 days longer than an anomalistic month.
9.
The center of the epicycle moved at a rate corresponding to the mean change in Moon's longitude, while the period of the Moon around the epicycle was an anomalistic month.
10.
This apsidal precession completes one rotation in the same time as the number of sidereal months exceeds the number of anomalistic months by exactly one, after about 3233 days ( 8.85 years ).
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